Can't Load Solver in Excel 2010

[yunuss]

Hello, our lecturer told us we'll need to use Solver in future at class, but when I checked my Excel>Data, there wasn't any button for the Solver.
I went to Options>Add-Ins>
I saw Solver Add-In under "Inactive Application Add-ins", then I clicked on Manage Excel Add-Ins, I ticked Solver and I got this error:

Microsoft Excel cannot acces the file "C/.............Solver.XLAM"

Help plix plox!

/Love.

[llDemonll]

you need the office CD that you used to install office.

This is why, during installation, i always choose to install everything to the computer and not the default option